The way to ensure that viruses are never introduced is by taking care of the pages that are visited.
The other is if pendrives that were infected are used.
If there are no strange problems; slow or hidden folders, is that it is not infected.
and having a good anti virus does not seem to you Mr. Moderator and dear Ennio asy problems are avoided je best regards and good night call me I have dinner and sleep after having failed to go down or try to lower an iso of windowds 7 from the Microsoft website he tells me that the key is factory je fence I am going to do an afternoon of work for nothing at all cases and health things please read my messages by private chat oki dear see you later good night .....